Union Properties , however, leapt 5.8 percent to close at 1.03 dirhams in its heaviest trade since Jan. 23 and accounted for almost half of trading volume on the exchange. It ended off its intra-day high of 1.12 dirhams, failing to conclusively break chart resistance at the end-February peak of 1.07.

Fund managers and traders said the reason for the jump was not clear but it could be related to positive corporate news that had not yet been disclosed.

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"Shares of UPP moved against the grain, and if it was just market participants taking a contrarian view on the stock, it would happen gradually. The volume spike in today's session suggests it's a company-specific event," one fund manager said.

Elsewhere, Abu Dhabi National Energy Co surged 7.1 percent in very heavy trade after its chief operating officer told Reuters it might sell some oil and gas interests in North America to raise capital for core businesses.

Profit-taking in other shares, however, pulled the Abu Dhabi index down 0.2 percent. First Abu Dhabi Bank fell 0.5 percent after trading as much as 1.4 percent higher earlier in the day.

The lender, which was formed on April 1 by the merger of National Bank of Abu Dhabi and First Gulf Bank, announced a 12.4 percent rise in combined "pro-forma" first quarter net profit to 2.93 billion dirhams ($798 million).

That was aided by a 145.5 percent jump in "other non-interest" income while loan impairment charges slipped 3.9 percent.

Most Saudi banking shares also fell, with Saudi Investment Bank the worst performer, down 1.6 percent. All Saudi banks have now reported first-quarter earnings; while results were mixed, most beat analysts' expectations.

The Saudi index was the worst performer in the Gulf for the week, down 2.5 percent.

In Doha, Gulf International Services dropped 5.0 percent after it reported an 81 percent slide in first-quarter profit to 15 million riyals ($4.1 million), far below QNB Financial's forecast of 452 million riyals and Alphamena's estimate of 378 million riyals.

The Qatari stock index fell 0.5 percent and was down 2.0 percent for the week.

In Egypt, the index edged up 0.1 percent in very low volume as Orascom Construction jumped 5.1 percent on news a major U.S. nitrogen fertiliser plant which it built had started operations.